There’s one main piece of advice I would give you for building a PC with gaming and/or game development in mind: Don’t skimp on the GPU.
I noticed you didn’t list a dedicated graphics card so my guess is you plan to rely on the integrated graphics in the CPU. This might sort of work, but saving some money on the other components so you can buy a dedicated GPU will have a huge positive impact on gaming performance.
Also, ask yourself when you last actually used a DVD drive. I haven’t used one in years, so you might be able to save some money by just leaving it out.